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- Question
There are two numbers such that the sum of twice the first and thrice the second is 39, while the sum of thrice the first, and twice the second is 36. The larger of the two is :
Options- A. 3
- B. 6
- C. 9
- D. 12
- Correct Answer
- 9
ExplanationLet the numbers be x and y. Then, 2x + 3y = 39...(i)and 3x + 2y = 30 ...(ii)
On solving (i) and (ii), we get : x = 6 and y = 9.
larger number = 9
- 1. Write down the power set of A = {8, 9}.
Options- A. {?, {8}, {9}, {8, 9}}
- B. {?, {8}, {9}}
- C. {?, {8}, {9}, {8, 9}}
- D. None of these Discuss
- 2. The area of two similar ?s are 121 cm 2 and 81 cm 2 respectively. What is the ratio of their corresponding heights (altitudes):
Options- A. 11 9
- B. 22 9
- C. 11 18
- D. 33 6 Discuss
- 3. In how many different ways, can the letters of the word 'VENTURE' be arranged?
Options- A. 840
- B. 5040
- C. 1260
- D. 2520 Discuss
- 4. Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?
Options- A. 14
- B. 28
- C. 42
- D. 35 Discuss
- 5. A number is selected at random from the set {1, 2, 3, ........, 50}. The probability that it is a prime, is
Options- A. 0.1
- B. 0.2
- C. 0.3
- D. 0.3 Discuss
- 6. Sonu can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijeet joined and completed it working for 10 days. In how many days Sonu and Abhijeet can do the complete work, working together?
Options- A. 6
- B. 8
- C. 10
- D. 12 Discuss
- 7. 19.003 x 22.998 - 280.010
Options- A. 220
- B. 110
- C. 160
- D. 90 Discuss
- 8. A person buys a book for ? 200 and sells it for ? 225. What will be his gain percent?
Options- A. 13%
- B. 14%
- C. 18.4%
- D. 12.5% Discuss
- 9. 3, 7, 15, 39, 63, 127, 255, 511?
Options- A. 7
- B. 15
- C. 39
- D. 63 Discuss
- 10. If A = { x : x = n-1/n+1, n ? W and n ? 10 } ;point out the correct statement from the following:
Options- A. 0 ? A
- B. 0 ? A
- C. 0 ? A
- D. 1/3 ? A Discuss
More questions
Correct Answer: {?, {8}, {9}, {8, 9}}
Explanation:
NA
Correct Answer: 11 9
Explanation:
Correct Answer: 2520
Explanation:
The required different ways = 7 ! / 2 !
= 7 x 6 x 5 x 4 x 3 x 2!/2!
= 2520
Correct Answer: 28
Explanation:
Alen's one day's work =1/21
Border's one day's work = 1/42
Alen and Border's two days work(working alternatively) = (1/21) + (1/42) = 1/14
So, Alen and Border do 1/14 work in 2 days
So, they complete the work in 14 x 2 = 28 days.
Correct Answer: 0.3
Explanation:
n(s) = 50
Prime numbers are = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
? n(E) = 15
? p(E) = 15/50 = 3/10 = 0.3
Correct Answer: 8
Explanation:
Efficiency of Sonu = (100/20) = 5%
Rest work = 75%
? Efficiency of Abhijeet = 75/10 = 7.5%
? Combined efficiency of Sonu and Abhijeet = 7.5 + 5 = 12.5%
? Number of days required by Sonu and Abhijeet, to work togethere = 100/12.5 = 8days
Correct Answer: 160
Explanation:
? = 19.003 x 22.998 - 280.010
? 19 x 23 - 280 ? 437 -280
? 157 ? 160
Correct Answer: 12.5%
Explanation:
Given that, CP = ? 200 and SP = ? 225
Profit = SP - CP = 225 - 200 = ? 25
? Gain% = [profit/CP] x 100%
= (25/200) x 100% = 12.5%
Correct Answer: 39
Explanation:
Go on multiplying 2 and adding 1 to get the next number. So, 39 is wrong.
Correct Answer: 0 ? A
Explanation:
NA
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